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Technical Briefs

Heat-Transfer Analysis of High Porosity Open-Cell Metal Foam

[+] Author and Article Information
Indranil Ghosh

Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, Indiaindranil@hijli.iitkgp.ernet.in

J. Heat Transfer 130(3), 034501 (Mar 05, 2008) (6 pages) doi:10.1115/1.2804941 History: Received September 13, 2006; Revised June 25, 2007; Published March 05, 2008

Forced convection heat transfer in high porosity metal foam, either attached to an isothermal surface or confined between two isothermal plates, has been analyzed, assuming a repetitive simple cubic structure for the foam matrix. The model, in the microscopic level takes account of the forced convective heat transfer coupled with heat conduction through the foam fibers. Analytical expressions have been derived for the gas-solid temperature difference, total heat transfer through the foam, and efficiency of foam as an extended surface. The resulting expressions have strong resemblance with those of the conventional finned surface. The effect of porosity and foam density on the heat transfer in metallic foam has been established through parametric studies. Significant heat-transfer augmentation due to cross connections in metal struts has been noticed.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Simple cubic representation of the metal foam from its original structure

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Figure 2

Simple cubic representation of foam in two dimensions to relate dp and pore density

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Figure 3

A comparison between the estimate value of dp and the data reported by manufacturer

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Figure 4

Nomenclature of the differential element for deriving foam equation

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Figure 5

Effect of pore density and Nusselt numbers on the temperature variation in aluminium foam

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Figure 6

Effect of pore density and Nusselt numbers on the total heat transfer

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Figure 7

Effect of pore density and Nusselt numbers on the fin efficiency of aluminium foam

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Figure 8

Effect of porosity and Nusselt numbers on the temperature variation in aluminium foam

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Figure 9

Effect of porosity and Nusselt numbers on the total heat transfer

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Figure 10

Effect of porosity and Nusselt number on the fin efficiency of aluminium foam

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